CVE-2016-4326: The Chef Manage (formerly opscode-manage) add-on before 1.12.0 for Chef allows remote attackers to execute arb

Q: How do I fix CVE-2016-4326?

chef manage: upgrade to newer than 1.11.4. Exact commands for each OS are on this page.

Q: Is CVE-2016-4326 being exploited?

CVE-2016-4326 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2016-4326 affect?

CVE-2016-4326 affects chef manage. Severity is critical (CVSS 9.8). The Chef Manage (formerly opscode-manage) add-on before 1.12.0 for Chef allows remote attackers to execute arbitrary code via crafted serialized data in a cookie.

Q: How urgent is CVE-2016-4326?

Priority 62/100. Critical severity; EPSS top 9%: very likely to be exploited; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2016-4326 is a critical-severity flaw (CVSS 9.8) affecting chef manage. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Chef Manage (formerly opscode-manage) add-on before 1.12.0 for Chef allows remote attackers to execute arbitrary code via crafted serialized data in a cookie.

Why this priority

Critical severity
EPSS top 9%: very likely to be exploited
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	4.2% (top 9%)
CISA exploited list	No
Published	2016-06-10
Last modified	2026-06-17

Publisher (CNA): CERT/CC · Vendor: chef

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2016-06-10 01:59 UTCPublished CVE record published
2026-06-17 00:47 UTCUpdated Record last modified

chef chef manage UPGRADE

Affected: <= 1.11.4

Fixed in: newer than 1.11.4

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy chef-manage || rpm -q chef-manage || chef-manage --version

2. UPGRADE to newer than 1.11.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade chef-manage

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade chef-manage

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2016-4326?

chef manage: upgrade to newer than 1.11.4. Exact commands for each OS are on this page.

Is CVE-2016-4326 being exploited?

CVE-2016-4326 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2016-4326 affect?

CVE-2016-4326 affects chef manage. Severity is critical (CVSS 9.8). The Chef Manage (formerly opscode-manage) add-on before 1.12.0 for Chef allows remote attackers to execute arbitrary code via crafted serialized data in a cookie.

How urgent is CVE-2016-4326?

Priority 62/100. Critical severity; EPSS top 9%: very likely to be exploited; Remotely exploitable, no login, no user action

Related CVEs

CVE-2017-7174 CRITICAL 9.8 DOWNGRADE The user-account creation feature in Chef Manage 2.1.0 through 2.4.4 allows remote attackers to execute arbitr

References

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